Amicum optimum meum amo (if your friend is male). Amicam optimam meam (if your friend is female).
true friends
I would have to say a true friend because you can always count on them.
habeo amicum
Carus amicus.
nam vera
Verum Gnaritas
Verum Sanguis
Amicus es in mundo.
Just say it! A true friend will understand
caraid (friend) fìor-charaid (true friend) dlùth-charaid (close friend) goistidh (bosom friend) deala-charaid (true friend) caraid ceart (a real friend) caomhnach (friend)
Just say politely and respectfully that your're sorry. If he/she is your true friend, then they will forgive you.
A female friend in Latin is amica (-ae, f.). (Since Latin has no articles, this will also do for "the female friend").
You would say "Usted no es un verdadero amigo".